We are fortunate. Our tang eats EVERYTHING. We feed Formula One and Two, frozen mysis shrimp, frozen chopped mussels and krill. We also use frozen angel formula. Early on we always had either a pice of romaine lettuce or nori clipped in the tank but he is not as interested in them now. I thing the live rock has begun to have more algae and he likes that. We have been surprised how much he enjoys the meaty foods.